Browse Prior Art Database

Electronic Keyboard

IP.com Disclosure Number: IPCOM000089126D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Passafiume, JE: AUTHOR

Abstract

An electronic keyboard has a plurality of keybuttons each actuating an associated keylever, the keylever in turn actuating electrical switches to provide an output character selection signal and, further, entering an interlock upon actuation to prevent other keylevers from being simultaneously actuated.

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Electronic Keyboard

An electronic keyboard has a plurality of keybuttons each actuating an associated keylever, the keylever in turn actuating electrical switches to provide an output character selection signal and, further, entering an interlock upon actuation to prevent other keylevers from being simultaneously actuated.

Downward force on keybutton 11 causes keylever 13 to rotate about pivot 15, actuating switch 17. A portion 19 of keylever 13 enters ballsometer interlock 21, preventing other keylevers from being pivoted in a downward direction. Keylever 13 stops downward travel when it hits repeat bail 23.

Logic is responsive to the closure of switch 17 to generate a signal. No further signals are generated until the switch is released. When it is desired to print a repeat character, increased keybutton pressure causes rotation of repeat bail 23 to activate switch 25. This causes the logic to sample switch 17 at intervals consistent with the machine cycle speed. There is a switch 17 associated with each keylever 13 and a single switch 25 associated with all keylevers.

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